下面用在旋轉視圖控制器的幾個方法，非常好用，其實還有大量的其他判斷方法，都不太靠譜

#import "OrientationViewController.h"@interface OrientationViewController ()@PRoperty (nonatomic, assign) BOOL shouldRotate;@end@implementation OrientationViewController- (void)viewDidLoad{    [super viewDidLoad];        /* iOS7 視圖進入的時候判斷方向 */        if ([[[UIDevice currentDevice] systemVersion] floatValue] < 8)    {        switch ([UIDevice currentDevice].orientation)        {            case UIDeviceOrientationPortrait:            {                NSLog(@"Portrait !!!");                break;            }            case UIDeviceOrientationLandscapeLeft:            case UIDeviceOrientationLandscapeRight:            {                NSLog(@"Landspace !!!");                break;            }            default:                NSLog(@"Unkown !!!");                break;        }    }}- (void)configureNotificaiton{    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(statusBarOrientationChange:)                                                 name:UIapplicationDidChangeStatusBarOrientationNotification object:nil];}- (void)statusBarOrientationChange:(NSNotification *)notification{    /* 配合這個方法，用在更新界面，控制先后 */}#pragma mark - UIViewController (UIViewControllerRotation).- (void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration{    [super willRotateToInterfaceOrientation:toInterfaceOrientation duration:duration];    }- (void)didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation{    [super didRotateFromInterfaceOrientation:fromInterfaceOrientation];            if ([[[UIDevice currentDevice] systemVersion] floatValue] < 8)    {        switch ([UIDevice currentDevice].orientation)        {            case UIDeviceOrientationPortrait:            {                NSLog(@"Portrait !!!");                break;            }                            case UIDeviceOrientationLandscapeLeft:            case UIDeviceOrientationLandscapeRight:            {                NSLog(@"Landspace !!!");                break;            }            default:                NSLog(@"Unkown !!!");                break;        }    }    else    {        /* iOS8 以上的處理 */    }}#pragma mark - Orientation Handler.- (BOOL)shouldAutorotate{    if (self.shouldRotate)        return YES;    else        return NO;}- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation{    if (self.shouldRotate)        return YES;    else        return NO;}- (UIInterfaceOrientationMask)supportedInterfaceOrientations{    if (!self.shouldRotate)    {        return UIInterfaceOrientationMaskPortrait | UIInterfaceOrientationMaskPortraitUpsideDown;    }    return UIInterfaceOrientationMaskAll;}@end